map is:exact -package:text -package:Cabal-syntax -package:conduit -package:dense-linear-algebra -package:incipit-base -package:foldl -package:filepath -package:case-insensitive -package:aeson -package:base -package:ghc -package:amazonka-core package:basement
Map all element a from a block to a new block of b
Map all elements in a list